“The search for clean and abundant energy sources started a long time ago, and now we know for sure many technologies are capable of producing clean energy. However they are not competent enough to produce the amount of energy required by our modern society.”
I totally agree with this argument. It will last a long time before clean energy can replace the other energies.

Finally, Fusion technology has been tested since 1932. Also, since 2008 ITER project has been developing the first commercial large scale reactor to test the economic and technology viability of this energy source, that hopefully will end the petroleum era.